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About TypeScript Generics: From Type Parameters to Type-Level Programming

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How TypeScript's generic system actually works: declaring and inferring type parameters, constraining them with extends, and composing keyof, indexed access, conditional, mapped, and template literal types into reusable type-level programs. Finishes with variance and assignability rules and the ability to read and rebuild every built-in utility type (Partial, Pick, ReturnType, ...) from first principles.

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What You'll Learn

Concepts:
Generic Type Argument Inference Built-in Utility Types Generic Type Parameters Distributive Conditional Types Generic Constraints with extends The infer Keyword Generic Functions keyof Operator Default Type Parameters Indexed Access Types Variance and Generic Assignability Mapped Types Conditional Types Generic Type Aliases Template Literal Types

What you will learn

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